JPH0718102Y2 - Downlight - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of use] The present invention relates to a downlight in which a lamp as a light source is housed in a tubular instrument body having an opening on the lower surface.

[Prior Art] As shown in FIG. 5, a downlight conventionally provided has a lamp 2 housed in a tubular instrument body 1 having an opening on the lower surface, and is shown in FIG. As described above, by sandwiching the ceiling material 5 between the flange 3 provided on the lower end edge of the instrument body 1 and the mounting claw 4 projecting on the peripheral surface of the instrument body 1, the ceiling material 5 is fixed to the ceiling. Has become.

In the downlight having the above configuration, the volume of the fixture body 1 is made relatively large in order to prevent the ceiling material 5 from being burned by the heat generated from the lamp 2 and the excessive temperature rise of the lamp 2, the socket, the lead wire, and the like. Moreover, it is general that the heat dissipation holes 6 are formed on the peripheral surface of the instrument body 1.

[Problems to be Solved by the Invention] However, with this configuration, the lighting fixture becomes large and conspicuous. Recently, there is a tendency to make the lighting equipment inconspicuous. Therefore, a low-voltage halogen bulb is used for the lamp 2, and a step-down transformer 7 is provided outside the equipment main body 1 as shown in FIG. Are provided. In this configuration, since the lamp 2 is small and has high brightness, and the step-down transformer 7 is disposed outside the fixture body 1, the fixture body 1 is downsized, and the mounting hole 8 formed in the ceiling material 5 is formed. The diameter and embedded height can be reduced.

By using a small lamp 2 in this way,
Although it is possible to reduce the size to some extent, the treatment of heat generated from the lamp 2 poses a problem when the size is further reduced. In particular, when only the heat ray is transmitted using the selective transmission type reflection mirror 9, the heat ray transmitted through the reflection mirror 9 is transmitted to the instrument body 1, and the instrument body 1 can be used for a long period of time. There is a problem that the ceiling material 5 in contact with the peripheral surface is burned.

The present invention is intended to solve the above problems, and it is an object of the present invention to provide a downlight capable of preventing the adverse effect on the surroundings due to the heat generated from the lamp while reducing the size of the fixture body. is there.

[Means for Solving the Problem] In order to achieve the above-mentioned object, the present invention has a tubular instrument body in which a lamp as a light source is opened and which is opened on the lower surface,
A plurality of ribs are provided on the outer peripheral surface of the lower end portion of the instrument body so as to be spaced apart from each other in the circumferential direction, and the tip surfaces of the ribs face the inner peripheral surface of the embedding hole formed in the mounting surface such as the ceiling. , A portion of the instrument main body which is continuous with the lower edge of the rib and which abuts the mounting surface at the peripheral portion of the embedding hole, and which corresponds to the ribs adjacent to each other in the circumferential direction at the base of the flange. Therefore, a plurality of ventilation holes are provided to communicate the inside and outside of the room with the mounting surface sandwiched therebetween.

[Operation] According to the above configuration, the ventilation hole is formed in the base portion of the flange so as to communicate the inside and outside with the mounting surface sandwiched therebetween, so that cool air is sucked from below to cool the peripheral surface of the instrument body. It is possible. Further, since the ventilation holes are formed between the ribs, the ribs are cooled by the cold air, and the amount of heat transferred from the peripheral surface of the instrument body to the flange or ceiling material via the ribs is reduced. To do.
Furthermore, since the instrument main body and the flange are connected via the rib, the cross-sectional area contributing to heat conduction from the peripheral surface of the instrument main body to the flange is reduced, and the amount of heat transferred to the flange is reduced. is there. Moreover, since there is a rib between the inner peripheral surface of the embedding hole formed in the mounting surface such as the ceiling and the outer peripheral surface of the instrument body, the outer peripheral surface of the instrument body is attached to the inner peripheral surface of the embedding hole. There is no direct contact with.

As described above, while cooling the instrument body, the heat of the instrument body is also radiated from the ribs, and moreover, the heat from the instrument body is made difficult to be transferred to the mounting member such as the ceiling material. It is possible to prevent burns such as the ceiling while reducing the size of the equipment body.

[Example] As shown in Figs. 1 and 2, the instrument body 1 is formed in a cylindrical shape having at least a lower surface opened, and a bowl-shaped reflecting mirror having an opened lower surface inside the instrument body 1. 9 are provided. The reflecting mirror 9 has a selective transmission property of transmitting only heat rays, and only visible rays are reflected on the reflecting surface. Therefore, it is possible to prevent the user from feeling too much heat while using the lamp 2 having a large amount of heat generation such as a halogen bulb. Of course, a normal reflecting mirror may be used if selective transmission is not required. The lamp 2 is arranged inside the reflecting mirror 9, and the lamp 2 is held in a socket 10 connected to the reflecting mirror 9. On the upper part of the peripheral surface of the instrument body 1, a plurality of holding springs 11 formed of elastic wire rods are mounted.
On the other hand, a plurality of ribs 12 are provided on the outer peripheral surface of the lower end portion of the instrument body 1 so as to be spaced apart from each other in the circumferential direction, and the flange 3 is provided so as to be continuous with the lower ends of the ribs 12. The front end surface of the rib 12 is set to face the inner peripheral surface of the mounting hole 8 formed in the ceiling material 5 to which the instrument body 1 is mounted. That is, the diameter of the envelope connecting the tip surfaces of the ribs 12 is set to be slightly smaller than the diameter of the inner peripheral surface of the mounting hole 8. Further, as shown in FIG. 3, ventilation holes 13 are formed in the base portion of the flange 3 at positions corresponding to each pair of adjacent ribs 12.

With the above configuration, the instrument body 1 is inserted into the mounting hole 8 from below, the flange 3 is brought into contact with the lower surface of the ceiling material 5 at the peripheral portion of the mounting hole 8, and the upper surface of the flange 3 and the tip portion of the holding spring 11 are provided. By sandwiching the ceiling material 5 between and, the instrument body 1 can be fixed to the ceiling material 5. In this state, as shown in FIG. 4, the ventilation hole 13 corresponds to the mounting hole 8 and communicates indoors and outdoors with the ceiling material 5 sandwiched between them. When heated, an ascending air current is generated and cold air is sucked from the vent hole 13, and this cold air rises along the outer peripheral surface of the instrument body 1. That is, the outer peripheral surface of the instrument body 1 is cooled by the cool air. At the same time, the rib 12 is also cooled. further,
Since the flange 3 is connected to the instrument body 1 via the rib 12, the cross-sectional area that contributes to heat conduction is small, and the amount of heat conducted to the flange 3 is small. Moreover,
Since the rib 12 acts as a spacer between the fixture body 1 and the ceiling material 5, the fixture body 1 which becomes high in temperature does not come into direct contact with the ceiling material 5.

[Effects of the Invention] As described above, the present invention has a tubular instrument body in which a lamp serving as a light source is opened on the lower surface, and a plurality of ribs are circumferentially provided on the outer peripheral surface of the lower end portion of the instrument body. The ribs are projected apart from each other, and the tip end surfaces of the ribs face the inner peripheral surface of the embedding hole formed in the mounting surface such as the ceiling, and are continuous with the lower end edges of the ribs at the lower end edge of the instrument body. A plurality of ventilation holes that extend a flange that abuts the mounting surface at the periphery of the embedding hole, and that sandwiches the mounting surface at the portions corresponding to the ribs that are circumferentially adjacent to the base of the flange and that communicates indoors and outdoors. Has been drilled,
Since the ventilation hole is formed in the base portion of the flange so as to communicate the inside and the outside with the mounting surface sandwiched, it is possible to cool the peripheral surface of the instrument body by sucking cool air from below. Further, since the ventilation holes are formed correspondingly between the ribs, the ribs are cooled by the cold air, and the amount of heat transferred from the peripheral surface of the instrument body to the flange, ceiling material, etc. through the ribs is reduced. . Further, since the instrument main body and the flange are connected via the rib, the cross-sectional area that contributes to heat conduction from the peripheral surface of the instrument main body to the flange is reduced, and the amount of heat transferred to the flange is reduced. Moreover,
Since there is a rib between the inner peripheral surface of the embedding hole formed in the mounting surface such as the ceiling and the outer peripheral surface of the instrument body, the outer peripheral surface of the instrument body directly contacts the inner peripheral surface of the embedding hole. There is no contact.

As a result, the instrument body is cooled, the heat of the instrument body is also radiated from the ribs, and moreover, the heat from the instrument body is difficult to be transferred to the mounting member such as the ceiling material, so that the instrument body can be downsized. There is an advantage that it is possible to prevent burns on the ceiling.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention, FIG. 2 is a perspective view from the lower side of the same, FIG.
FIG. 5 is a cross-sectional view of the main part of the above, FIG. 5 is a perspective view showing a conventional example,
FIG. 6 is a sectional view showing the same mounting state as above, and FIG. 7 is a sectional view showing another conventional example. 1 ... Instrument body, 2 ... Lamp, 3 ... Flange, 5 ... Ceiling material, 8 ... Mounting hole, 12 ... Rib, 13 ... Vent hole.

Claims (1)

[Scope of utility model registration request] 1. An apparatus main body having a cylindrical shape, which is opened at the lower surface and accommodates a lamp as a light source, and a plurality of ribs are provided on the outer peripheral surface of the lower end portion of the apparatus main body so as to be spaced apart from each other in the circumferential direction. The front end surface of the rib faces the inner peripheral surface of the embedding hole formed in the mounting surface such as the ceiling, and the lower end edge of the instrument body is continuous with the lower end edge of the rib and is A flange that abuts the mounting surface at the peripheral portion is extended, and a plurality of ventilation holes that communicate indoors and outdoors with the mounting surface sandwiched at the portions corresponding to the ribs adjacent to each other in the circumferential direction are formed at the base of the flange. Downlight made up of.